发明名称 |
PERFORMING PREDICATE EVALUATION ON COMPRESSED CHARACTER STRING OF VARIABLE LENGTH |
摘要 |
Methods, devices and computer program products for performing predicate evaluation on a compressed variable length character string are disclosed. Aspects include determining upper and lower boundaries of a false positive range for a predicate, the false positive range for the predicate being a range in which a result of the predicate evaluation may lead to a false positive error. Aspects also include compression-encoding the upper and lower boundaries of the false positive range and performing a first comparison for comparing the compressed variable length character string with the compression-encoded upper and lower boundaries of the false positive range. Aspects further include determining a result of the predicate evaluation based on at least a result of the first comparison processing. |
申请公布号 |
US2015379119(A1) |
申请公布日期 |
2015.12.31 |
申请号 |
US201514711907 |
申请日期 |
2015.05.14 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
CHEN XING;LIU SHAORONG |
分类号 |
G06F17/30 |
主分类号 |
G06F17/30 |
代理机构 |
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代理人 |
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主权项 |
1. A method for performing predicate evaluation on a compressed variable length character string comprising:
determining, by a processor, upper and lower boundaries of a false positive range for a predicate, the false positive range for the predicate being a range in which a result of the predicate evaluation may lead to a false positive error; compression-encoding the upper and lower boundaries of the false positive range; performing a first comparison for comparing the compressed variable length character string with the compression-encoded upper and lower boundaries of the false positive range; and determining a result of the predicate evaluation based on at least a result of the first comparison. |
地址 |
ARMONK NY US |